Crystallization system applying crystal enlarging device

The invention discloses a crystallization system applying a crystal enlarging device. The crystallization system comprises a crystallizer body, a demister, a crystal thickening device, a first feeding device, a mother liquor discharging pipe and an elutriator, wherein the demister is arranged at the top end of the crystallizer body, the crystal thickening device is arranged at the bottom end of the crystallizer body, the elutriator is arranged below the crystal thickening device, the first feeding device is connected with the crystallizer body, the crystal thickening device comprises the elutriator and a second feeding device, and the elutriator is connected with the second feeding device. According to the invention, the crystal thickening device is additionally arranged, and the grain size of the obtained crystal can be increased to 250-400 microns by utilizing the elutriator and the second feeding device connected with the elutriator, so that the crystal salt with small specific surface area can be obtained